Question 37442
Let x = the part invested at 13% and $11,000-x = the part invested at 15%.


Then:
13%x + 15%($11,000-x) = $1,610
0.13x + 0.15(11,000-x) = 1,610
0.13x + 1,650 -0.15x = 1,610
-0.02x = -40
x = $2,000
$11,000 -x = $9,000


The answer is that $2,000 was invested at 13% and $9,000 was invested at 15%.